Hibernate shuts off comp but shutdown now -h doesn't

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Hey,
 I have a P4 2.8 GHz 915 , ASUS Mobo , Slackware linux 12 running
kernel 2.6.23 right now , but have used most of the major (2.6.*)
releases since 2.6.17

My computer on shutdown now -h never shut down. A "power down" is
printed on the screen and the monitor goes black, but the comp never
actually shutdown. I always had to kill power manually. I tried with
the generic kernel supplied with slackware (everything is a module) as
well as the huge kernel (everything is compiled in) as well as my own
kernel builds since 2.6.18. Nothing made by comp actually halt on its
own. I assumed it was a faulty ACPI on my computer, and didn't think
much of it.

I installed the latest 2.6.23 kernel. After installing , the shutdown
now -h command still doesn't work. But I tested out the
hibernate/suspend to disk via:

echo shutdown >> /sys/power/disk
echo disk >> /sys/power/state

In this case, the system halts down.

I want to know : if the hibernate / suspend to disk can halt my
computer why can't shutdown now -h. Any reasons for this / fix ?

Regards,
dev

Also , a 'halt' entry in my grub's menu.lst shuts down my computer just fine.
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